diff --git a/README.md b/README.md
index c09b84eba..e8bac089c 100644
--- a/README.md
+++ b/README.md
@@ -1075,7 +1075,7 @@ heroku run rake searchkick:reindex CLASS=Product
 Create an initializer `config/initializers/elasticsearch.rb` with:
 
 ```ruby
-ENV["ELASTICSEARCH_URL"] = "https://es-domain-1234.us-east-1.es.amazonaws.com"
+ENV["ELASTICSEARCH_URL"] = "https://es-domain-1234.us-east-1.es.amazonaws.com:443"
 ```
 
 To use signed requests, include in your Gemfile: